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Wettable polymeric materials prepared from 2-50% by wt. N-(1,1-dimethyl-3-oxobutyl)acrylamide, 2.5% by wt. crosslinking agent and methyl methacrylate

US 3,984,485 A · Inventors: Neefe; Charles W.

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed June 6, 1975 and granted October 5, 1976. A patent filed before June 8, 1995 lasts 17 years from grant or 20 from filing, whichever is longer, so its term ended June 6, 1995.
  • Any extension is capped at five years, so it can't still be in force.
  • We haven't checked its US family, and a later related patent could still be in force. We check US rights only.
FiledJune 6, 1975
GrantedOctober 5, 1976
Term endedJune 6, 1995
Application number05/584283
Classification (CPC)A61F9/0017 +2 more
Length2 pages

Timeline

Timeline From USPTO dates

1976197819801982198419861988199019921994Application filedJune 6, 1975Patent grantedOct 5, 1976Term endedJune 6, 1995

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.